The Effect of Microstructure on the Thermal Conductivity of ZnS/Diamond Composites
CORNELL UNIV ITHACA NY DEPT OF MATERIALS SCIENCE AND ENGINEERING
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We have observed that the thermal conductivity of zinc-sulphide is increased by adding large particles of highly conducting diamond, but lowered by the addition of sub-micron size particles of diamond. This effect is explained in terms of the interfacial thermal resistance which becomes increasingly dominant as the particles become smaller because that increases their surface to volume ratio. A phenomenological model in which the interface resistance is expressed as an effective Kapitza radius, aK, is presented. The conductivity of the composite is analyzed for different values of alpha which is defined to be equal to the Kapitza radius divided by the particle radius.
- Inorganic Chemistry